Error using textscan Invalid file identifier Use fopen to generate a valid file identifier in app designer

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sydney salvador
sydney salvador 2020-4-28
评论： sydney salvador 2020-5-1
I use a button to upload my "Data.txt" file and another button to calculate and plot it into UIaxes but im having error in "fid=fopen"
properties (Access = public)
selectpath='';
end
% Callbacks that handle component events
methods (Access = private)
% Button pushed function: UploadButton
function UploadButtonPushed(app, event)
[file,path] = uigetfile('*.txt')
end
% Button pushed function: CalculateButton
function CalculateButtonPushed(app, event)
fid=fopen(Data.txt(app.selectpath));
fclose(fid); %Error using textscan
% Invalid file identifier.
% Use fopen to generate a valid file identifier.
seek=textscan(fid,'%f %f','headerlines',2);
g = cell2mat(seek);
x=g(:,1);
y=g(:,2);
[sortedX, sortIndex] = sort(x);
sortedY = y(sortIndex);
sortedXLimit = sortedX(1:160,:);
sortedYLimit = sortedY(1:160,:);
plot(app.UIAxes,value*peaks) %for the graph
app.UIAxes.YLim = [0 205];
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Tommy
Tommy 2020-4-30
编辑：Tommy 2020-4-30
It doesn't seem like your upload button stores anything. It saves the file and path into file and path and then exits, at which point the file and path are lost. This would work:
function UploadButtonPushed(app, event)
[file,path] = uigetfile('*.txt');
if file == 0
% handle case where user clicks cancel
else
app.selectpath = fullfile(path, file);
end
end
And then in your other callback:
function CalculateButtonPushed(app, event)
fid=fopen(app.selectpath);
seek=textscan(fid,'%f %f','headerlines',2);
...
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Tommy
Tommy 2020-5-1
Hmm... I'll assume you want to plot your sorted and trimmed y over your sorted and trimmed x, in which case you should try
plot(app.UIAxes,sortedXLimit,sortedYLimit)
If that's not what you want, could you provide the code which worked for you?

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sydney salvador
sydney salvador 2020-5-1
[sortedX, sortIndex] = sort(x);
sortedY = y(sortIndex);
sortedXLimit = sortedX(1:160,:);
sortedYLimit = sortedY(1:160,:);
plot(app.UIAxes,sortedXLimit,sortedYLimit)
app.UIAxes.YLim = [0 1000];
hold on
findpeaks(sortedYLimit,sortedXLimit,'MinPeakProminence',205,'Annotate','extents')
sir my peaks arent showing on the graph on app designer, it shows in another window in matlab and when i use hold on it does not work

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